Load contract state files in tests with the full state size

test/contract_qswap.cpp

@@ -65,7 +65,7 @@ class ContractTestingQswap : protected ContractTesting
 
 	bool loadState(const CHAR16* filename)
 	{
-		return load(filename, sizeof(QSWAP), contractStates[QSWAP_CONTRACT_INDEX]) == sizeof(QSWAP);
+		return loadContractState(QSWAP_CONTRACT_INDEX, filename);
 	}
 
 	QSWAP::InvestRewardsInfo_output investRewardsInfo()

test/contract_qx.cpp

@@ -141,7 +141,7 @@ class ContractTestingQx : protected ContractTesting
 
     bool loadState(const CHAR16* filename)
     {
-        return load(filename, sizeof(QX), contractStates[QX_CONTRACT_INDEX]) == sizeof(QX);
+        return loadContractState(QX_CONTRACT_INDEX, filename);
     }
 
     // TODO: add other functions

test/contract_testing.h

@@ -62,6 +62,24 @@ class ContractTesting : public LoggingTest
         }
     }
 
+    // Load a contract state file, which must match the current state size exactly.
+    bool loadContractState(unsigned int contractIndex, const CHAR16* filename)
+    {
+        const unsigned long long stateSize = contractDescriptions[contractIndex].stateSize;
+        FILE* file = nullptr;
+        if (_wfopen_s(&file, (const wchar_t*)filename, L"rb") != 0 || !file)
+            return false;
+        _fseeki64(file, 0, SEEK_END);
+        const long long fileSize = _ftelli64(file);
+        fclose(file);
+        if (fileSize < 0 || (unsigned long long)fileSize != stateSize)
+        {
+            std::cout << "State file has " << fileSize << " bytes, expected " << stateSize << std::endl;
+            return false;
+        }
+        return load(filename, stateSize, contractStates[contractIndex]) == stateSize;
+    }
+
     void initEmptySpectrum()
     {
         initSpectrum();